The Centers for Advanced Orthopaedics
Maryland Orthopedic Specialists
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Shoulder

Little Leaguer's Shoulder

Little Leaguer's Shoulder is a stress injury to the growth plate at the top of the upper arm bone in young overhead athletes — most commonly adolescent baseball pitchers. It is entirely preventable, fully treatable with rest, and an important signal that throwing workload and sport specialization need to be addressed. At Maryland Orthopedic Specialists, we specialize in youth overhead athlete health and provide comprehensive evaluation, treatment, and return-to-sport guidance for this condition.

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What is little leaguer's shoulder?

Little Leaguer's Shoulder is a overuse injury generally resulting from baseball. It is a Salter-Harris Type I stress fracture of the proximal humeral physis (growth plate). In adolescent athletes whose growth plates are still open, the cartilaginous physis is the weakest link in the bone-tendon-muscle unit.

Little Leaguer's Shoulder is a Salter-Harris Type I stress fracture of the proximal humeral physis (growth plate). In adolescent athletes whose growth plates are still open, the cartilaginous physis is the weakest link in the bone-tendon-muscle unit. Repetitive rotational and distraction forces from overhead throwing — particularly during the late cocking and deceleration phases — create cyclic stress across the physis, leading to a physeal stress response or frank physeal fracture.

The proximal humeral physis is the fastest-growing physis in the body and one of the last to close (typically around age 16–18). This extended period of vulnerability makes it susceptible to overuse in young overhead athletes across multiple years of development.

How It Differs from a Traumatic Fracture

Unlike an acute proximal humerus fracture from a fall, Little Leaguer's Shoulder is a chronic stress injury from repetitive loading — not a single event. There is no specific traumatic incident; instead, there is a gradual onset of pain in the context of increasing or excessive throwing workload.

Treatment options

Complete Rest from Throwing — 3 Months

The foundation of treatment is complete cessation of all throwing for approximately 3 months. This is not negotiable — continued throwing through physeal stress injury risks displacement of the fracture, growth disturbance, and permanent deformity. Most athletes are also advised to avoid other upper extremity sports that stress the shoulder.

Return-to-Throw (RTT) Protocol

After the mandatory rest period and documented healing, athletes progress through a structured interval return-to-throw program: - Phase 1: Flat-ground tossing, beginning at 30–45 feet, for 10–15 throws at 50% effort - Progressive increase in distance, then volume, then intensity over several weeks - Off-mound throwing begins only after completing flat-ground phases pain-free - Return to competitive pitching at full volume typically at 4–6 months from injury

Pitch Count and Specialization Prevention Discussion

Little Leaguer's Shoulder is a workload injury. A critical part of management is educating the athlete, parents, and coaches on evidence-based pitch count limits and rest intervals established by USA Baseball and Little League Baseball. Additionally, year-round single-sport specialization — particularly pitching without seasonal breaks — significantly increases injury risk. We discuss:

Frequently Asked Questions

Can my child keep playing in the outfield or batting while resting from pitching?
Batting and outfield play still involve shoulder stress. We typically recommend complete upper extremity rest from all throwing activities during the initial rest period. Playing other positions is assessed on a case-by-case basis.
Will this affect my child's growth?
Properly rested physeal stress injuries heal without growth disturbance in the vast majority of cases. The risk of growth plate complications is associated with continued throwing through symptoms — which is why early recognition and rest are so important.
How do I prevent this from happening again?
Strict adherence to pitch counts, mandatory seasonal rest from throwing, proper mechanics (particularly hip rotation and leg drive to reduce arm stress), and avoiding year-round single-sport specialization are the most evidence-supported preventive measures.
Should my coach be monitoring pitch counts?
Absolutely — pitch count limits and mandatory rest days are the single most effective tool for preventing Little Leaguer's Shoulder and other overhead throwing injuries in youth athletes. USA Baseball, Little League International, and the American Sports Medicine Institute (ASMI) all publish age-specific pitch count guidelines with required rest periods based on pitches thrown. For example, pitchers aged 11–12 should throw no more than 85 pitches per game, with 4 days of rest after throwing 66 or more pitches. Coaches, parents, and athletes should all know these limits — and they should be enforced even when a child feels fine, since the physeal stress that causes this injury accumulates before pain begins. If your league or travel program is not tracking pitch counts, that is worth addressing directly with the coaching staff.
Should my child see a specialist or is a pediatrician enough?
We recommend evaluation by an orthopedic surgeon with experience in youth overhead athletes. While a pediatrician is an important first step, confirming the diagnosis of Little Leaguer's Shoulder requires specific X-ray views of the proximal humeral physis — and in some cases an MRI — to assess the degree of physeal widening and rule out other causes of shoulder pain such as labral pathology or stress fracture. An orthopedic specialist will also guide the return-to-throw program and help determine when your child has cleared the milestones needed to safely resume pitching. Early specialist involvement reduces the risk of incomplete healing and recurrence.

Meet the specialists

Christopher S. Raffo, MD

Christopher S. Raffo, MD

Orthopedic Surgery · Sports Medicine

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John J. Christoforetti, MD

John J. Christoforetti, MD

Orthopedic Surgery · Sports Medicine · Hip Preservation Surgery

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James S. Gardiner, MD

James S. Gardiner, MD

Orthopedic Surgery · Sports Medicine

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Peter G. Fitzgibbons, MD

Peter G. Fitzgibbons, MD

Hand Surgery · Orthopedic Surgery

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Medically reviewed by Christopher S. Raffo, MD
Last reviewed June 12, 2026

References

  1. Dotter WE. Little leaguer's shoulder: a fracture of the proximal epiphyseal cartilage of the humerus due to baseball pitching. Guthrie Clin Bull. 1953;23:68–72.
  2. Osbahr DC, Kim HJ, Dugas JR. Little league shoulder. Curr Opin Pediatr. 2010;22(1):35–40. doi: 10.1097/MOP.0b013e328334909b.
  3. Heyworth BE, Kramer DE, Martin DJ, Micheli LJ, Kocher MS, Bae DS. Trends in the presentation, management, and outcomes of Little League shoulder. Am J Sports Med. 2016;44(6):1431–1438. doi: 10.1177/0363546516634529.
  4. Fleisig GS, Andrews JR, Cutter GR, et al. Risk of serious injury for young baseball pitchers: a 10-year prospective study. Am J Sports Med. 2011;39(2):253–257. doi: 10.1177/0363546510384224.
  5. Lyman S, Fleisig GS, Andrews JR, Osinski ED. Effect of pitch type, pitch count, and pitching mechanics on risk of elbow and shoulder pain in youth baseball pitchers. Am J Sports Med. 2002;30(4):463–468. doi: 10.1177/03635465020300040201.
  6. American Academy of Orthopaedic Surgeons. Little Leaguer's Shoulder. OrthoInfo. https://orthoinfo.aaos.org/en/diseases--conditions/little-leaguers-shoulder/